【摘要】 针对传统GPS接收机在高动态环境下跟踪性能不理想、跟踪精度差的问题,提出一种载波频率辅助相位矢量跟踪算法,利用锁频环(Frequency Locked Loop,FLL)辅助锁相环(Phase Locked Loop,PLL)的方式代替传统单一跟踪环路,通过集中式滤波器对接收机各通道中频信号进行综合处理,同时完成对多颗可视卫星信号跟踪和导航信息解算。给出一种适合高动态环境下的载波频率辅助相位锁定环结构,详细分析了矢量跟踪下集中式滤波器的状态方程和量测方程,给出了跟踪环路反馈量,与传统标量跟踪模式下的跟踪性能进行了对比。仿真结果表明,载波频率辅助相位矢量跟踪算法比传统标量跟踪精度更高,可以更好的处理高动态信号。更多还原

【Abstract】 The traditional GPS receiver in high dynamic environment tracking performance is not ideal,a kind of vector tracking algorithm based on carrier frequency assist phase is proposed,the frequency lock loop and the phase lock loop are used to replace the traditional single tracking loop,the intermediate-frequency signal of each channel receiver is comprehensively processed through the centralized filter,and at the same time,the signal tracking and integrated navigation information processing for all visible satellites are achieved. The phase lock loop structure for carrier frequency is given which is suitable for high dynamic environment,the system state equation and measurement equation of the centralized filter are analyzed in detail,the tracking loop feedback is given,and the tracking performance is compared with that of the traditional scalar tracking mode. The simulation results show that the proposed algorithm has better precision than scalar tracking,which can better handle the high dynamic signal.更多还原